Sitting on the bench with your back to the table. A chain is put from your collar above and around the table, under the table back to your hands, which are cuffed together behind your back. Feet and knies bound to the sides of the bench - so that you can't close them.
If possible chastity not hiding underneath clothing, so it is visible ...

Earplugs and blindfolded - so you dont know if someone is around

I am nosy - what kind of latex shoes do you own? I am looking for some nice ones...
krinlyc

I prefer the scenarios where you are prevented to get to the keys/knife by the ice-lock(s), because such scenarios are simpler to implement (with ice-stuff ado, though). I like @krinlyc's idea, with an addition that there will be an icelock between the handcuffs and the collar. Two more icelocks can be placed between the ankle cuffs and the bench (like in the spread-eagle scenario). In this case, the key to the handcuffs can be left in the car, or far away, so when you are released by the locks you will have to walk to the keys handcuffed and gagged.